In his State of the Union address, President Obama doubled down on his gun-control proposals, again demanding that Congress ban so-called “assault weapons” and “high capacity magazines.” This is not a surprise. What has been a surprise are the increasingly open calls for defiance from gun owners, state legislatures, and local law enforcement. If the president’s proposals become law, he may move the country into turbulent waters we haven’t seen in many years.

Gun control has long been a controversial issue in American politics. However, there are three aspects to this issue that make this more volatile than other hot topics such as taxes, foreign policy, or abortion…